HTML Phone Number Input Form with Plus Button

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body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            padding: 20px;
        }

.card {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            padding: 60px 50px;
            border-radius: 24px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            max-width: 600px;
            width: 100%;
            animation: fadeIn 0.6s ease-out;
        }

@keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

h1 {
            font-size: 28px;
            font-weight: 600;
            color: #1a202c;
            margin-bottom: 32px;
        }

.controls {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }

.number-display {
            flex: 1;
            min-width: 200px;
            padding: 16px 20px;
            font-size: 20px;
            border: 2px solid #e2e8f0;
            border-radius: 12px;
            background: #f7fafc;
            color: #1a202c;
            font-weight: 500;
            transition: all 0.3s ease;
            user-select: none;
        }

.number-display:hover {
            border-color: #cbd5e0;
            background: white;
        }

.increment-button {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border: none;
            border-radius: 12px;
            color: white;
            font-size: 28px;
            font-weight: 300;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

.increment-button:hover {
            transform: translateY(-2px) scale(1.05);
            box-shadow: 0 6px 25px rgba(102, 126, 234, 0.5);
        }

.increment-button:active {
            transform: translateY(0) scale(0.95);
        }

.submit-button {
            padding: 16px 40px;
            font-size: 18px;
            font-weight: 600;
            color: white;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border: none;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
            flex-shrink: 0;
        }

.submit-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 25px rgba(102, 126, 234, 0.5);
        }

.submit-button:active {
            transform: translateY(0);
        }

@media (max-width: 600px) {
            .card {
                padding: 40px 30px;
            }

h1 {
                font-size: 24px;
            }

.number-display {
                width: 100%;
                font-size: 18px;
                padding: 14px 16px;
            }

.controls {
                gap: 12px;
            }

.increment-button {
                flex: 1;
            }

.submit-button {
                flex: 1;
            }
        }
    </style>
</head>
<body>
    <div class="card">
        <h1>Please enter your phone number:</h1>
        <div class="controls">
            <div class="number-display" id="display">(216) 409-9992</div>
            <button class="increment-button" id="plusButton" type="button">+</button>
            <button class="submit-button" type="button">Submit</button>
        </div>
    </div>

function refresh() {
                display.textContent = format(currentNumber);
            }

function increment() {
                currentNumber++;
                refresh();
            }

btn.onclick = increment;

refresh();
        })();
    </script>
</body>
</html>

HTML Phone Number Input Form with Plus Button

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